On the mass market level, mobile-based money market funds dominate. The category accounts for 60 percent of investments in Chinese public funds, according to John Ott, Shanghai-based partner and lead in financial services practice at Bain & Company.

For example, the primary money market fund on Yu'e Bao, a mobile investment service run through Alibaba-affiliate Ant Financial, became the largest such fund in four years. It had more than 470 million users as of the end of 2017, according to Ant, and about 1.45 trillion yuan ($211 billion) in assets as of the end of June, public data showed.

"The next wave, we think, will be into fixed income," Ott said. He predicted allocation to money market funds will fall to about 50 percent in the next five years, while the proportion of fixed income investment will rise to 20 percent from 15 percent.

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